US PATENT SUBCLASS 340 / 693.2
.~.~ Substitute or emergency source (e.g., back-up battery)

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
693.1  DF  .~ Specified power supply {3}
693.2.~.~ Substitute or emergency source (e.g., back-up battery)

DEFINITION

Classification: 340/693.2

Substitute or emergency source (e.g. back-up battery):

(under subclass 693.1) Subject matter wherein upon the failure of a primary power supply there is energized a

secondary power supply to maintain operation of the electrical means providing the humanly perceptible signal.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

64+, for substitute or emergency source in a generic plural power supply transmission system.